“Biscuits Alive” posted that video where he explains in detail how the FF and MFT equivalence works. He writes:

There is still a lot of incorrect information out there about –
-Depth of field
-Crop sensor vs full frame cameras
-Speedboosters
-Light refraction

And it seems many people who profess to know all about their camera gear, don’t actually fully know some of the basics regarding-
-Aperture
-Focal length
-The focus plane
-Crop factor
-The Circle of confusion
-ISO
-Image noise

So I decided to talk about all of the above, and I drew some simple illustrations for you, and also took a few photos to help show what is actually happening to the light as it travels through our cameras lens.

Ben sent me his valuable insights on the GH5:

My name is Ben Pendlebury and I’m a wedding videographer from a city called Derby in the UK. I’ve been filming weddings for over four years now and last year I switched over from Canon to a full GH5 set-up.  I’ve really fallen in love with this camera and after using it for over six months, I was keen to make a Youtube review, talking about the good and bad things about the camera from a wedding videographer’s point-of-view.
I’ve spent a long time making the video and have included lots of b-roll showing the camera in use, as well as footage captured at weddings: